By the time I'm 40 interplanetary travel will be common. Nobody will want to talk to me at that age anyway.

I've always liked Saturn. But I also have some sympathy for Pluto because I heard it's been downgraded from a planet and I think it should remain a planet. Once you've given something planetary status it's kind of mean to take it away.

Man is the animal that intends to shoot himself out into interplanetary space after having given up on the problem of an efficient way to get himself five miles to work and back each day.

A permanent base on Mars would have a number of advantages beyond being a bonanza for planetary science and geology. If as some evidence suggests exotic micro-organisms have arisen independently of terrestrial life studying them could revolutionise biology medicine and biotechnology.

I believe it is essential for our planetary future to develop tools that can change the consciousness which has created the crisis that we are in.

Our world faces a true planetary emergency. I know the phrase sounds shrill and I know it's a challenge to the moral imagination.

My childhood dreams were focused on being part of the effort to make humanity a multiplanetary species.

What is a television apparatus to man who has only to shut his eyes to see the most inaccessible regions of the seen and the never seen who has only to imagine in order to pierce through walls and cause all the planetary Baghdads of his dreams to rise from the dust.